Improvement in steam-engines



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STEAM-ENGINE. K

No.181,315. Patented Aug. v22, 1876.

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ffy/wfg I g l N PETERS. PHOTO-LITHOGRAPNEH, WASHINGTON. D. C.

UNITED STATES PATENTr'r'rcEo AYLET'I R. CRIHFIELD, OF LINCOLN, ILLINOIS.

IMPROVEMENT IN STEAM-ENGINES.

Specification forming part of Letters Patent No. 181,315, dated August22, 1876, application filed December 23, 1875. l

To all whomt't may concern:

Beit known that I, AYLETT R. GRIHFIELD, of the city of Lincoln, countyof Logan, and State of Illinois, `having invented certain Improvementsin Steam'- Engines, `or engines to be operated by any elastic uid underpressure, hereby declare the annexed specification to be a correctdescription of the same.

The object sought is to obtain the eective use or service of two crankson one shaft by the use of one cylinder, thereby obviating thedead-centers.

In the annexed drawings, which are a part ot' this specification, I uselike letters of ref-y erence for the 4same parts, as exhibited in thevarious figures or drawings.

Z, Figure l, is a cylinder, cut away in order to show its internalparts. M is a head or partition, set inside of said cylinder to divideit into two parts. It is tightly packed, and made secure and solid.. Oneach side ot' said stationary head or partition M I place a pistonhead,K K", and attached to each one is a piston-rod, D and P, respectively.The piston-rod P is hollow,'and terminates at the crosshead H, att-achedto which is a stuffing-box, G, said cross-head being supported by thesliding bars S S. The piston-rod D, attached to the piston-head K,passes through a stuii'- ing-box in thev center of the head M, andpasses into and through the hollow piston-rod P, the stufling-boX B, andterminates at, and is attached to, the cross-head N. rIhe crosshead Hcarries a connection-rod, I, which Ais connected with a crank, C. Thecross-head N carries a connection-rod,j, which is aixed to a crank, L,said cranks C and L being on one shaft, and set at right angles witheach other.

0n each side of the interior head or partition M portways are made toadmit power,

said portways being indicated by the letters o o w w into the cylinderto press upon the piston-heads K K".` VThe valve v is operated by theeccentric E working the -valve-rod'q. Fig. 2 shows the under side ofthevalve c. y y are slots cut through the valve, and when lying in itsplace, as shown in Fig. 1,-said slots move upon and over the portways oo, alternately opening and closing said ports.

The hollow parts of the valve (marked b b) connect with the slots y y,and while the valve is in motion the hollow parts b b will traverse overthe portways o o, permitting steam or other elastic pressure to passinto the cylinder, arid move the piston-head K and .rod D to the end ofthe stroke ofthe crank L, when the supplementary valve t, Fig. 3, is, bymeans of the lugs i t' t' working against the xed points r 1', made tocover the slots'y y, in such manner that the hollow part thereof (markedt, Fig. l5) covers the portways, and permits the exhaust to pass -upthrough the slot h, Fig. 2, and through the exhaust-opening at X,Fig. 1. The exhaust-Ways for the ports o o and fw fw come together at X,Fig. l. The portways w w are operated by that part of the valve c markedt, and which is the ordinary slide-valve.

What I Vclaim as my invention, and desire to secure by Letters Patent,is-

The combination of the cylinder Z, the fixed head M, the piston-heads `KK", the hollow piston-rod P, 'and the piston-rod D the valve "v and thesupplementary valve t, operating together, for the uses and purposesdescribed.

AYLEIT It. CRIHFIELD. Witnesses:

JOHN C. FICKEE, STEPHEN LLOYD.

